Q. Wp and Wf are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor Wp/Wf is 0.95, the workability of concrete is

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Q. For given water content, workability decreases if the concrete aggregates contain an excess of

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Q. Internal friction between the ingredients of concrete, is decreased by using

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Q. For road pavements, the cement generally used, is

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Q. Construction joints are generally provided in concrete

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Q. M10 grade of concrete approximates

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Q. For ensuring quality of concrete, use

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Q. According to I.S. : 456, the number of grades of concrete mixes, is

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Q. The mixture of different ingredients of cement, is burnt at

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Q. The risk of segregation is more for

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Q. After casting, an ordinary cement concrete on drying

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Q. Hydration of cement is due to chemical action of water with

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Q. To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between

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Q. Permissible compressive strength of M 300 concrete grade is

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Q. The standard sand now a days used in India, is obtained from

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Q. To ensure constant moisture content in aggregates

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Q. Workability improved by adding

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Q. The commonly used material in the manufacture of cement is

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Q. If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is

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Q. Curing a concrete for long period ensures better

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